Spring-mounting for magnet-armatures.



G. J. ERIUKSON.

SPRING MOUNTING FOR MAGNET ARMATURES. APPLICATION FILED DEC.14, 1905.

1 62,586, Patented May 27, 1913. 5 l 5 v, Ill

I n ZUzizaZsa f UNITED STATES FATENT OFFICE.

cHAELEs a. EBIGKSON, or onrcn'eo, armors, .assrenon, ,BYLEESNE ASSIGNMENTS,

'ro Ems'r 'rnusr Ann savmes BANK, TRUSTEE, E onrcaeo, ILLINOIS.

SPRING-MOUNTING FOR mGNET-ARMATUBES.

To all whom it may concern Be it knownthatl, CHARLES J. Erickson,

a citizen of the United States of America,

and resident of Chicago, Cook county, I111- nois, have invented a certain new and use- 'ful Improvement in Spring-Mountings. for

' ered, my invention contemplates a armonic or tuned ringer having its armature and striker mounted upon a torslonal spring ad'- justed for a definite pitch 'or rate of vibration.

My invention relates to electric bells or ringers in general, but more particularly to electric bells or r ngers for use in selective.

party-line or signaling systems, and especially to electric bells or ringers of that particular type known asharmonic ringers.

Generally stated, the object of my invention is the provision of an improved and highly efficient electric bell or ringer.

Special objects ofmy invention are the provision of an improved and highly eflioient harmonic electric hell or ringer for use in party-line telephone systems, or other selective signaling systems; the provision of an improved construction and arrangement whereby a harmonic ringer of this character may have a striker which is supported upon a spring, or which is so. connected with a spring that the oscillation or vibratory motion of the striker tends to subject the spring to a twist or torsional strain; the provision of an improved construction and arrangement whereby the striker of a harmonic bell or ringer may be mounted upon a fiat spring which extends at a right angle to the striker,

and which has its opposite ends secured or supported in such manner that the striker oscillates or vibrates about an axis which extends longitudinally of the said spring;.

the provision of an improved construction and arrangement for effecting the adjustment of the armature of a harmonic ringer toward and away from the poles of the elec-- tro-magnet; the provision of an improved Specification of Letters Patent. Ia ncamn filed December 14; 1905. Serial 1%. 291,680.

Patented May 2%,1913.

construction and arrangement for effecting a ready adj ustment of the gongs toward and away from the striker of the harmonic ringer; the provision of an improvised oonstruction and arrangement whereby the spring upon which the striker of the har monic r1nger is mounted may be secured upon and at right angles to the yoke which connects the cores ofthe electro-magnets; andthe provision of certain details and features of improvement tending to increase" the general eflieiency and serviceability of a harmonic ringer of this particular character.

My present invention is in the nature of animprovement on the bell or rin er disclosed and claimed broadly in application No. 292,187, filed by me in the United States gaggnt Oflice on the 18th day of December,

To the foregoing and other useful ends, my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings, Figure 1 is a front elevation of a harmonic ringer embodying the principles of my invention, a portion of one. of the gongs being broken away to show the manner of mounting the same. Fig. 2 is a vertical section on line 22 in Fig.1. Fig. 3 is a horizontal-section 'online 3 '3 in Fig. i. Fig. 4 is a detail plan view of one. of the adjustable gongmountings. Fig. 5 is a detail plan View of the spring or reed upon which the striker and armature are mounted Figs. 6 and 7 are detail views illustrating another way of mounting the torsional spring.

As thus illustrated, my improved harmonic ringer comprises an upper bracketplate A to which are secured the gongs B. Each gong is mounted upon a swinging mounting C, as shown more clearly in Fig. 4. As illustrated, each gong-mounting is pivoted at its rear end by a screw 0, and provided at its forward end with a slot (1 .to which extends a fastening-screw 0 With this arrangement, the said gong-mountings are adapted to be swung about their rear pivotal points to bring them nearer together or farther apart, according to requirements. These lgong-mountings are preferably raised or are ed at their middle portions, so as to support the gongs in suitably elevated positions. The gongs are secured to their respective mountings by thumb-nuts or screws 1). A lower bracket-plate D is suspended from the upper bracket-plate A by hangers a. It will be seen that the bracketplate D is secured to the lower ends of these hangers by means of screws (L The permanent magnet E is secured at its upper end upon the bracket D and retained in place thereon by a strap 03'. As illustrated, the electro-magnets F are also suspended from the bracket-plate D and are secured to the latter by screws f. The lower end portion of the magnet-cores; are each provided with a circular groove 2 adapted to be engaged by the inner edges of the frame-like yoke G, as shown in Figs. 1 and 3. This yoke has secured to it a reed or spring H which extends transversely across the under side of the yoke, and which has its end portion secured to the latter by means of the screws h. It will be seen that the said reed or spring H is provided at one end with a screw-hole h and at its other end with a screw-notch 71. which facilitate the attachment and removal of the spring. The center of the said spring is provided with an opening h adapted to receive the screwthreaded lower end port-ion of the strikermounting I; the striker-rod c, with its adjustable striker i, being suitably mounted upon the upper end portion of the said striker-mounting, as shown more clearly in Fig. 2. A nut i clamps the said spring firmly against the shoulder i on the said striker-mounting. The vibratory armature J has its middle portion provided with an opening through which passes the lower threaded end portion of the striker-mounting I, as shown in Figs. 1 and 2. An ad justable thumb-nut j is screwed upon the said striker-mounting and adapted to bear upon the upper surface of the armature J. In addition, a clamping-nut 7' is also screwed upon the said striker-mounting and adapted to bear upon the lower surface of' the said armature. In this 'way, the strikermounting is rigidly and firmly. clamped upon the middle or intermediate portion of the spring or reed H, and the armature is adjust'ably clamped upon the lower end ortion of the rigid upright structure which carries an adjustable striker at its upper end. With the arrangement shown, the lower end portion 6 of the permanent magnet is disposed centrally and at a point just below the middle portion of the armature.

With the foregoing construction, it is evident that the passage, for example, of an alternating current through the coils of the electro-ma nets F will cause the armature J to vibrate 1n the usual and well-known manner. The ringer may be tuned to respond only to a certain frequency, as by tuning the reed or spring H, or by adjusting the striker 6 up or down on its rod 2'. Obviously, however, the bells or ringers can all be of the type or construction shown and described,

and the selectivity of signalin can then be secured by simply adjusting t e strikers of the different ringers. Consequently, it is not necessary to construct several different kinds of harmonic ringers for selective party-line telephone systems, as with my improvements the bells or ringers can all be alike, and the diflerence intheir responsiveness to different frequencies can be obtained by simply giving each one a somewhat different adjustment from the others. In other words, the different bells can be made responsive to different frequencies by giving each one practically a different length of striker which, in the theory of harmonic or sympathetic vibration, is technically known as changing the length of the pendu lum. Obviously, the strain or tension to which the spring or reed H is subjected is of a torsional character, inasmuch as the armature and striker are rigidly mounted upon the center of the spring in such manner that the oscillation of the armature and striker is about an axis extending longitudinally of the spring. In other words, the spring is held or mounted at its two ends, and the magnets, through the medium of the armature, apply their force or power to the center of the spring, and thus subject the latter to a twisting action.

In assembling the parts, the yoke G is first plicable to various orms of electric bells or ringers.

If desired, the torsional spring H can be mounted as shown in Figs. 6 and 7. In this case, the yoke G is provided on its under surface with bosses g which are of about the diameter of-the heads of the screws It. With this arrangement, the contact between the spring and the yoke is reduced practically to a minimum and there will be no interference with the desired torsional flexion or action in the sprin As shown, the striker an armature and torsional sprin are all readily removable as a unit from t e balance of the structure; In this way, a thicker or thinner ring can be supplied readily and without sturbing the other parts of the structure. 'For example, the striker i has a certain range of adjustment on the striker-rod i. However, should this range of.adjustment be insufliquencies of current, the striker and spring and armature can be quickly removed and another but differently proportioned unit readily substituted therefor. Thus the bell is within limits adapted to be adjusted to any frequency of current, and should this range of adjustment be insuflicient another striker and armature and spring can be {)eadily substituted for those already in the ell.

It will be understood, of course, that my improved method of mounting electromagnet armatures can be used in various device secured to and supported by a stiff torsional spring is broadly new so far as I. am now aware. ringer provided'withastiif torsional spring adjusted for a definite pitch or rate of vibration, so that the bell will only respond to an alternating current of a certain frequency, is broadly new.

It will be seen that the plate A is adapted to be placed on top of the box or casing which incloses the electromagnets and other means for operating the striker. The gongs are on top or outside of the casing, as are also the devices for adjusting the gongs toward andaway from each other. In this way it is not necessary to enter the casing for the purpose of adjusting the gongs relatively to each other. This is a great advantage in a ringer, and particularly in a ringer for use 1n. harmonic or selective party-line systems. i

What I claim as my invention is 1. An electric bell comprising gongs, electro-magnets, a striker, a flat sprlng extending at a right angle to the plane in which the striker vibrates, an armature carried -by its ends onsaid As illustrated, I have em Furthermore, a harmonic bell or said spring and rigidly connected with the said striker, and means whereby the striker itself is adjusted toward and away from the armature.

2. In a telephone ringer, electromagnets having their cores extending slightly beyond the end of the coils thereof, a bridge extending across the electro'ma ets and apertured for the reception of sai extended cores, a leaf sprin mounted transversely by liridge, and an armature and hammer rigidly supported by the spring between the ends thereof for torsional movement therewith in response to the electromagnets.

3. An electricbell or ringer comprising a pair of gongs, a pair of electromagnets, a torsional spring rigidly supported at its opposite ends, andan armature and striker rigidly mounted upon and supported by the middle portion of said spring, the spring being arranged with its length extending at a right-angle to, the plane in which the armature and striker oscillate or vibrate.

4. An electric bell comprising gongs, electromagnets, a striker, a torsional spring extending at a right-angle to the plane in which the striker, vibrates, an armature carried by said'spring and connected with said striker, and means whereby the striker itself is adjusted toward and away from the armature.

5. In a telephone ringer, electromagnets having their cores extending slightly beyond the end of the coils thereof, a bridge extending across the electromagnets apertured for the reception of said extended cores, a torsional spring mounted transversely by its ends on said bridge, and an armature and hammer rigidly supported by the spring between the ends thereof for torsional movement therewith in response to v the electromagnets.

Signed by me at Chicago, Cook county,

Illinois, this 12th day of December, 1905.

Witnesses:

Enw. D. FALES, M. A. EDSON.

CHARLES J. ERICKSON. 

